package netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class NettyClint {
    private static ExecutorService executor=Executors.newFixedThreadPool(4);
    private static NettyClientHandler client;
    //编写方法使用代理模式，获取一个代理对象
    public Object getBean(final Class<?> serivceClass, final String providerName) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class<?>[]{serivceClass}, (proxy, method, args) -> {
                   /* System.out.println("(proxy, method, args) 进入...." + (++count) + " 次");*/
                    //{}  部分的代码，客户端每调用一次 hello, 就会进入到该代码
                    System.out.println(client);
                    if (client == null) {
                        initClient();
                    }
                    //设置要发给服务器端的信息
                    //providerName 协议头 args[0] 就是客户端调用api hello(???), 参数
                    client.setPars(providerName + args[0]);
                    Object o = executor.submit(client).get();
                    return o;
                });
    }

    private static void initClient(){
        client=new NettyClientHandler();
        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                .handler(
                        new ChannelInitializer<SocketChannel>() {
                            @Override
                            protected void initChannel(SocketChannel ch) throws Exception {
                                ChannelPipeline pipeline = ch.pipeline();
                                pipeline.addLast(new StringDecoder());
                                pipeline.addLast(new StringEncoder());
                                pipeline.addLast(client);
                            }
                        }
                );
        try{
            bootstrap.connect("127.0.0.1",7000).sync();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}
